Method of and apparatus for producing glass containers with reentrant bottoms



March 30, 1937. l.. D. soun-:HER 2,075,77

, METHOD OF AND APPARATUS FOR PRODUCING GLASS CONTANERS WITH REENTRANT BOTTOMS Filed Aug. 16, 1954 2 Sheet's--Sheeil 1 51 4 JNVENToR.

ATTORNEY 2 Sheets-Sheet 2 March 30, 1937. L. D. souBlER METHOD OF AND APPARATUS FOR PRODUCING GLASS CONTAINERS WITH REENTRANT BOTTOMS INVENTOR.

ATTORNEY Patented Mar.` 3G, 1937 UNITED STATES Pii'lEjlv-'rN oFFlcE METHOD OF AND APPARATUS FOR PRODUCING GLASS CONTAINERS WITH REENTRANT BOTTOMS Leonard D. Soubier, Toledo, Ohio, assgnor to Qwens-Illinois Glass Company, a corporation of Ohio Application August 16, 1934, Serial No. 740,130

7 Claims.

.up bottoms.

An outstanding feature of the present invention y isthe provision of means whereby the plunger which creates the reentrant bottom on the bottle or other container, is projected into the mold during the expansion of the blank or parison with the result that the glass forming the reentrant bottom is gradually and uniformly stretched and distributed over the plunger. As a result, uniformity in the thickness of the bottom walk is obtained.

Another object is the provision of means whereby the blanks or parisons are expanded in the finishing molds by vacuum and this same vacuum utilized to project the reentrant bottom forming plunger into the mold.

Other objects will be in part apparent and in part pointed out hereinafter.

In the drawings: n

Fig. l is a side elevational view, partly in section, of one mold group of the well known Owens type machine .showing the present invention embodied therein.

Fig. 2 is a sectional view 'takenalong the line II-II of Fig. 3.

Figs. 3, 4,- 5, and 6 are detail views illustrating the successive steps involved in formingl bottles with reentrant bottoms through the use of the present invention. Fig. 3 s a sectional elevational view of the finishing mold unit showing the blank or parison enclosed therein. Fig. 4 is a similar view illustrating the iirst stages of the blank expanding operation and the plunger projected a short distance into the mold. Fig. 5 is a view similar to Fig. 4 but showing the blank almost completely expanded. Fig. 6 illustrates theiinal expansion and complete formation of the reentrant bottom on the bottle.

` The present invention is illustrated in conjunction withv the well known Owens suction type bottle forming machine, which, briefly stated,

consists of a rotary moldcarriage I- mounted upon a stationary b ase II and supporting mold groups I2, each including a blank mold unit I3 and finishing mold unit.,A I4, the former including a neckmold I3a and body blank mold I3b and being brought into charging contact with a supply body of molten glass I by rotation of said carriage. The carriage is rotated by means including a drive shaft I6, a pinion I 1 thereon, and a ring gear I8 attached toI the lower side of the mold carriage and-meshing with said pinion.

The finishing mold unit I4 consists of a vertically swinging mold carrier I9 pivoted to a horizontal hinge pin 20 on the carriage III, said cairier being adapted for vertical swinging movement under inuence of a track 2I which operates through a roller 22 on the lower side of said mold carrier. The finishing mold 23 consists of two half sections 24 pivoted to a vertical hinge pin 25 rising from said carrier I9. These mold sections are moved relative to each other about said hinge Apin 25 by means including a cam 26 operating through a roller 21 to reciprocate a slide 28 radially of the mold carriage, said slide being connected through links 29 tol arms 3 0 which in turn are suitably connected to the mold sections. Theforegoing construction corresponds to that found in the conventional bottle machine of the above type and isdisclosed in greater detail in La France Patent 1,185,687 datedfJune 6, 1916.

`Upon completion of a blank or parison it is transferred to the finishing mold unit 23 in which it is expanded to its final shape. the present invention this final expansion of the blank or parison is obtained by the application of vacuum or suction to the finishing Amold.

cavity. Moreover, such application of vacuum is employed in the projection of a plunger into the mold, such projection being for the purpose of creating a reentrant or push-up bottom on the container. The construction involved may be substantially as follows..

Vacuum grooves 3l are provided in the opposed meeting faces of the two finishing mold sections 24, said grooves extending substantiallythe full height of the mold and at their lower ends opening into semi-circular channels 32 or grooves which in turn are connected to passageways 33. When the mold is closed these passageways 33 register with the conduits 34 in the mold carrier I9, said conduits being connected to a vacuum supply pipe 35 which leads to a control valve 36. This valve 36 may be of any conventional or preferred form. A stationary cam 31 is adapted to open the valve 36 at regular time intervals vfor the purpose of establishing communication betwensaid pipe. 35 and'a conduit 38 which leads to avacuum chamber 39 arranged at the 'upper end of the'machine. l

The bottom plate or former unit 40 consists of a plunger 4I shaped to conform to the contour of the recess which is to be created in the bottom of the container. This plunger is carried by a piston 42 which is mounted in a vertical motor cylinder 43, said piston being retained within thf` According to cylinder by means of a collar 44 suitably attached to the lower end of said cylinder. 'I'he motor cylinder which is axially aligned with the mold extends upwardly through an opening 45 in the 5 mold carrier I9 and at its upper end is formed with an outwardly directed flange 46. 'I'his ilange rests upon the top surface of the mold carrier I9 inproximity to said opening .45 and thereby maintains the cylinder in proper relation to the l0 corresponding mold. In order that the application .of vacuum or suction to the nishing mold cavity may also operate to project the plunger into the mold, said motor cylinder 43 is provided with a series of vacuum ports 41 through which communication is established between the interior of said motor cylinder and a continuous upwardly facing channel 48 which registers with the semicircular channels 32 when the mold is completely closed.

In operation, the blank or parison of glass While suspended from the neck mold I3a is enclosed in the corresponding finishing mold. Immediately thereafter, or following a reheating period such as is frequently resorted to, the vacuum control valve 36 is opened. Thereupon the air is exhausted from the finishing mold cavity with the result that the blank or parison isex.- panded to the form of the mold cavity. While such removal of the air from the mold cavity tends to cause comparatively rapid projection 'of the plunger 4I to its uppermost position, such complete projection meets with resistnce on the part of the blank or parison. During expansion of the blank such resistance to projection of the plunger gradually decreases so that the plunger is completely projectedA just prior to nal expansion of the blank. As a result of so producing the reentrant bottom, the glass is comparatively slowly stretched over the plunger 40 in a fashion to effect uniform distribution of the glass throughout the bottom structure.

Modifications may be resorted to within the spirit and scope of the appended claims.

What-I claim is:

l. The method of producing a glass container having a reentrant bottom which consists in placing a parison in a finishing mold, expandl ing the parison, and projecting a former into the lower end of the parison during expansion thereof and under influence of the expanding medium.

2. In a machine for producing glass containers, a iinishing mold in which a blank is adapted to be placed for iinal expansion, a bottom former including a plunger mounted for reciprocation 55 axially of the former and mold and adapted for projection into the mold, means for applying vacuum to the mold and thereby expanding 'the blank therein, and means whereby such application of vacuum causes movement of the plunger into the mold.

3. In a machine for producing glass containers, a nishing mold in which a blank is adapted to be placed for final expansion, a bottom former including a plunger mounted for reciprocation axially of the former and mold and adapted for projection into the mold, means for applying vacuum to the mold and thereby expanding the blank therein, a piston motor operatively connected to the plunger, and means whereby said application of vacuum to the mold also operates' the piston motor and causes projection of the plunger into said mold.

4. In a machine for producing glass containers, a finishing mold in which a blank is adapted to be placed for final expansion, a bottom plate including a centrally disposed plunger mounted for axial movement through said bottom plate into the mold, a holder for said plunger including a piston, a cylinder carried by said bottom plate and enclosing the piston,.means for expanding the blank, and means whereby said blank expanding means operates` the piston and causes projection of the plunger into the mold.

5. In a machine for producing glass containers, a :finishing mold in which a blank is adapted to be placed for final expansion, a bottom plate including a centrally disposed plunger mounted for axial reciprocation through said bottom plate, a holder for said plunger including a piston, a cylinder carried by said bottom plate andenclosing the piston, means for expanding the blank, and means for applying vacuum to the mold for expanding the blank and to the upper end of said cylinder for projecting the plunger into the mold simultaneously with expansion of the blank.

6. In a glassware forming machine, a iinishing mold carrier, apartible nishing mold thereon having vacuum grooves in its meeting faces, a

source of vacuum supply communicating with said grooves, a bottom platemounted upon the mold carrier and including a cylinder having vacuum grooves and ports establishing communication between the interior of the cylinder and the vacuum grooves inthe mold sections, a piston in said cylinder, and a plunger carried by the piston and adapted for projection into the mold to form a reentrant bottom on the articlev of glassware produced on said mold.

7. In a machine for producing glass containers, a finishing mold ,comprising two sections, means for opening and closing the mold, a bottom plate about which the mold is adapted to close, a cylinder depending from and formed integrally w1th the bottom plate, a piston in said cylinder, a plunger carried by the piston and adapted for projection into the mold at times, said bottom plate and mold sections having circular vacuum channels in register with each other, said bottom plate and cylinder having ports establishing communication between the channels and interior of the cylinder, said mold sections having vacuum grooves extending upwardly from said channels and formed in the meeting faces of said sections, and means for applying vacuum to said channels.

LEONARD D. SOUBIER. 

